hexagon logo
Register Sign in
  • Replies 18 replies
  • Subscribers 222 subscribers
  • Views 256 views
  • Users 0 members are here
Options
Related

Problems with aligning model and CAD=Part

markchurch
Previously I have always transformed the model prior to any programming; however, I have decided to try Matt's method.

From the book of Matthew:

Try all of this:

Alignments:

First of all, to do ANY alignment, 3-2-1 or iterative, you MUST have XYZ values for whatever you use for the alignment.

Step #1
Do this no matter WHAT type of alignment you are going to do.
1) Place the part on the table the way it will sit for your inspection
2) Import your model data BEFORE you do any measuring
3) Using the CTRL-F3 option (3-D rotate), rotate the cad data until it matches the way the part sits on the machine, remembering that as you look at the screen you are looking DOWN on the machine
4) Once you have the cad data rotate (you are actually ONLY rotating the VIEW of the cad data), use F5 to open the setup options.
5) Go to the Part/Machine tab and while looking at the 3-D rotate cube, set your CAD to MACHINE axis
6) Click OK
7) Set your workplane to the ‘top’ of the cube (if the top, facing YOU face of the cube is X-, use the X- workplane)

.

When I complete step 6) the model flips back to it's original orientation. Should this happen? If I continue through the rest of Matt's steps for aligning it and then do a CAD=Part it is still misaligned like step 5) had no effect. I'm programming offline. Thanks in advance for any help.
Attached Files
  • If you're programming offline and created the manual alignment features from the model, no transformation will take place after CAD=Part. This function corrects the manual alignment feature nominals to match the CAD alignment. When you program straight from the model, nothing should change.

    Your best solution is to transform the CAD model to the orientation you will be using on the CMM and go from there, which I believe you said you were doing before. If you have the proper tools, why not use them.
  • If you're programming offline and created the manual alignment features from the model, no transformation will take place after CAD=Part. This function corrects the manual alignment feature nominals to match the CAD alignment. When you program straight from the model, nothing should change.

    I did complete all the steps including CAD=Part.

    Your best solution is to transform the CAD model to the orientation you will be using on the CMM and go from there, which I believe you said you were doing before. If you have the proper tools, why not use them.

    This is just for educational purposes. Nothing ventured, nothing gained, right.
  • Question that I have is; Did you do a Part / machine setup? I setup the part to the machine. I arrange the machine XYZ axis to the part XYZ. So therefore you don't have to 'transform' the CAD to the machine; you make the machine axis the same as the part.
  • Question that I have is; Did you do a Part / machine setup? I setup the part to the machine. I arrange the machine XYZ axis to the part XYZ. So therefore you don't have to 'transform' the CAD to the machine; you make the machine axis the same as the part.


    Yes, I did.
    Attached Files
  • Make sure that you don't have a 'viewset' inside the program.
  • Make sure that you don't have a 'viewset' inside the program.

    No viewsets.

    Question: Should the trihedral for the CAD model move when I click OK to close the Setup Options window? Or should this happen when doing a CAD=Part?
  • Disclaimer: I don't do any of this, ever. And I rarely ever transform CAD either.

    I don't think the trihedron should move at all Mark. Your coordinate system shouldn't change. You're only telling PC-DMIS what machine axis equals what CAD axis.

    I use iterative alignments. Once the manual iterative alignment is done, machine coordinates are mated to CAD coordinates, and no further tinkering is needed. No CAD=PART, no transforms, no workplane changes (except for some 2d dimensions).
  • The CAD model trihedron should not move. The only that that should happen, is the axis of the machine will change. Also, make sure you click Apply after orienting the machine axis.
  • The CAD model trihedron should not move. The only that that should happen, is the axis of the machine will change. Also, make sure you click Apply after orienting the machine axis.

    Can't remember if I hit apply or not. I'll start over and make sure I do that.
  • Brian,

    So the when I click apply the CAD model rotates back to it's original orientation when it was imported undoing any view changes made with the 3D rotate.
© 2024 Hexagon AB and/or its subsidiaries. Privacy Policy | Cloud Services Agreement